1285263 has 24 divisors (see below), whose sum is σ = 2216448. Its totient is φ = 701712.

The previous prime is 1285259. The next prime is 1285267. The reversal of 1285263 is 3625821.

1285263 = T₃₇ + T₃₈ + ... + T₁₉₇.

It is an interprime number because it is at equal distance from previous prime (1285259) and next prime (1285267).

It is not a de Polignac number, because 1285263 - 2² = 1285259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1006 + ... + 1892.

It is an arithmetic number, because the mean of its divisors is an integer number (92352).

2^1285263 is an apocalyptic number.

1285263 is a deficient number, since it is larger than the sum of its proper divisors (931185).

1285263 is a wasteful number, since it uses less digits than its factorization.

1285263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 920 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1285263 is about 1133.6944032675. The cubic root of 1285263 is about 108.7253134611.

The spelling of 1285263 in words is "one million, two hundred eighty-five thousand, two hundred sixty-three".